A high-performance transparent optoelectronic display device and its preparation method and application

Abstract

This application discloses a high-performance, transparent optoelectronic display device, its preparation method, and its application. The device's specific structure can be represented as follows: a first transparent substrate, a transparent tungsten conductive electrode, a tungsten oxide cathode electrochromic material layer, an electrolyte layer, a silver conductive electrode, and a second transparent substrate. This device can effectively replace the transmissive or reflective display screens in traditional in-vehicle head-up display systems, and together with a projection device, form a head-up display system. By regulating the voltage, the driver can change the device's operating state, switching between a colored operating state and a colorless, transparent off state, thereby improving viewing comfort for the driver.

Description

Technical Field

[0001] The present application relates to the field of display devices, and in particular to a photoelectric display device and a preparation method and application thereof. Background Art

[0002] Electrochromism refers to the phenomenon in which a material's optical properties (such as reflectivity, transmittance, and absorptivity) undergo stable and reversible changes in response to an applied electric field, manifesting as a reversible change in transparency or color. This technology has been widely used in architectural glass, photochromic glasses, automotive anti-glare rearview mirrors, military camouflage, and spacecraft thermal control.

[0003] Head-up displays (HUDs) are intelligent systems used in vehicles, allowing drivers to view navigation, speed, and location information without looking down. Commonly used HUD systems on the market typically consist of a projector and a receiving display. However, the receiving display's functionality is relatively limited, displaying only a single background color. Furthermore, when not in use, the color of the receiving display can interfere with the driver's viewing experience, reducing comfort. Summary of the Invention

[0004] The purpose of this application is to provide a photoelectric display device for use in a vehicle-mounted head-up display system to replace the traditional receiving display screen in the display system, improve the viewing experience in the non-working state, and provide more background color options in the working state.

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned optoelectronic display device.

[0006] Another object of the present invention is to provide an application of the above-mentioned optoelectronic display device in a vehicle-mounted head-up display system.

[0007] In order to achieve the above objects, the technical solution adopted by the present invention is:

[0008] A photoelectric display device has a film structure comprising a first transparent substrate, a tungsten transparent conductive electrode, a tungsten oxide cathode electrochromic material layer, an electrolyte layer, a silver conductive electrode, and a second transparent substrate.

[0009] Preferably, the thickness of the tungsten transparent conductive electrode is 2-10 nm.

[0010] Preferably, the thickness of the tungsten oxide cathode electrochromic material layer is 150-250 nm.

[0011] Preferably, the silver conductive electrode has a thickness of 2-5 nm.

[0012] Preferably, the first transparent substrate and the second transparent substrate have the same size, both having a length of 400-2000 mm and a width of 200-2000 mm.

[0013] The method for preparing the above-mentioned optoelectronic display device comprises the following steps:

[0014] (1) using a magnetron sputtering process to prepare a tungsten transparent conductive electrode on a first transparent substrate and a silver conductive electrode on a second transparent substrate;

[0015] (2) using a magnetron sputtering process to prepare a tungsten oxide cathode electrochromic material layer on a tungsten transparent conductive electrode;

[0016] (3) annealing the material layer prepared in step (2);

[0017] (4) Pressing the first transparent substrate and the second transparent substrate against each other to form an interlayer, and then filling a mixed solution of liquid electrolyte and photocurable resin to complete the packaging;

[0018] (5) The encapsulated device is irradiated with an ultraviolet lamp to achieve solidification of the electrolyte layer, thereby obtaining the optoelectronic display device.

[0019] Preferably, the magnetron sputtering process in step (1) is: DC mode, vacuum environment is 5-10mTorr, sputtering power is 30-50W, and sputtering time is 5-20s;

[0020] The magnetron sputtering process in step (2) is: DC mode, vacuum environment is 5-10mTorr, sputtering power is 50-100W, and sputtering time is 5-15min;

[0021] The annealing step in step (3) is carried out in an air atmosphere, the annealing temperature is 100-150° C., and the annealing time is 1-2 hours.

[0022] An application of the above-mentioned optoelectronic display device in a vehicle-mounted head-up display system.

[0023] Preferably, the vehicle-mounted head-up system includes a projection emission device, the optoelectronic display device according to any one of claims 1 to 5, a front platform, and a front windshield.

[0024] Preferably, the arrangement of the vehicle-mounted head-up display system is as follows: the projection emitting device is arranged on the front platform of the vehicle, and the photoelectric display device is arranged between the front windshield and the projection emitting device with an adjustable front-to-back distance to accommodate different projection display areas. Compared with the prior art, the present invention has the following advantages:

[0025] (1) When in a non-working state, the optoelectronic display device is in a highly transparent state, which can provide a good viewing experience for the driver.

[0026] (2) By adding an extremely thin tungsten transparent conductive electrode behind the tungsten oxide cathode electrochromic material layer, a semi-transmissive and semi-reflective effect of the device for the optoelectronic display can be achieved. When observing through the device, the information displayed by the projection device and the real-time environment of the road can be seen at the same time.

[0027] (3) Compared to traditional transparent electrodes such as ITO and FTO, tungsten electrodes have a higher tolerance to external voltages. Using tungsten metal as an electrode allows the device to operate at higher voltages, thereby improving the device's response speed. Furthermore, compared to other metals, tungsten metal has better bonding with tungsten oxide, which can extend the device's service life.

[0028] (4) The tungsten oxide cathode electrochromic material layer is prepared using the magnetron sputtering process, which can accurately control the film thickness to construct optical microcavities with different effects, and the prepared material surface is uniform and of excellent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a device for an optoelectronic display; wherein 100 refers to a first transparent substrate, 105 refers to a tungsten transparent conductive electrode, 110 refers to a tungsten oxide cathode electrochromic material layer, 115 refers to an electrolyte layer, 120 refers to a silver conductive electrode, and 125 refers to a second transparent substrate.

[0030] Figure 2 The figure is a schematic diagram of the structure of a photoelectric display device used in a vehicle head-up display system; wherein 111 is the above-mentioned photoelectric display device, 112 is a projection emission device, 121 is the front platform of the vehicle, 122 is the front windshield of the vehicle, and 131 is the projection display area.

[0031] Figure 3 for Figure 2 A side view of the 111 component.

[0032] Figure 4 It is the transmission and reflection spectrum of a device used in optoelectronic displays. DETAILED DESCRIPTION

[0033] The present application is described in further detail below with reference to the accompanying drawings.

[0034] The raw materials, reagents, etc. not marked with the manufacturer in this application are all conventional products that can be purchased commercially.

[0035] The present application discloses a high-performance transparent optoelectronic display device, the structure of which comprises a first transparent glass substrate (100), a tungsten transparent conductive electrode (105), a tungsten oxide cathode electrochromic material layer (110), an electrolyte layer (115), a silver conductive electrode (120), and a second transparent glass substrate (125).

[0036] The method for manufacturing a device for an optoelectronic display of the present application specifically comprises the following steps:

[0037] Step (1): preparing a tungsten transparent conductive electrode on a first transparent glass substrate by a magnetron sputtering process, wherein the magnetron sputtering operation mode is a DC mode, the vacuum environment is 5-10 mTorr, the sputtering power is 30-50 W, the sputtering time is 5-20 s, and the thickness of the tungsten transparent conductive electrode is 2-10 nm;

[0038] Step (2): preparing a silver conductive electrode on a second transparent glass substrate by a magnetron sputtering process, wherein the magnetron sputtering operation mode is a DC mode, the vacuum environment is 5-10 mTorr, the sputtering power is 30-50 W, the sputtering time is 5-20 s, and the thickness of the silver conductive electrode is 2-5 nm;

[0039] Step (3): preparing a tungsten oxide cathode electrochromic material layer on a tungsten transparent conductive electrode by a magnetron sputtering process, wherein the magnetron sputtering operation mode is a DC mode, the vacuum environment is 5-10 mTorr, the sputtering power is 50-100 W, the sputtering time is 5-15 min, and the thickness of the tungsten oxide cathode electrochromic material layer is 150-250 nm;

[0040] Step (4): After the tungsten oxide cathode electrochromic material layer is deposited onto the tungsten transparent conductive electrode, the first transparent glass substrate is placed on a hot plate for annealing at a temperature of 100-150° C. for 1-2 hours. The annealing step will optimize the electrochromic properties of the tungsten oxide film.

[0041] Step (5): pressing the first transparent glass substrate and the second transparent glass substrate face to face to form an interlayer, and then filling the interlayer with a mixed solution of liquid electrolyte and photocurable resin by utilizing the capillary absorption phenomenon;

[0042] Step (6): Use ultraviolet light to irradiate the packaged device to achieve solidification of the electrolyte layer.

[0043] The vehicle head-up display system composed of this device and the projection emission device is arranged as follows: Figure 2 As shown. The projection emitting device (112) and the photoelectric display device (111) are arranged on the front platform (121) of the vehicle. The position of the photoelectric display device can be adjusted to a certain extent in front and back distance to adapt to different projection display areas (131).

[0044] When not in operation, the projection emission device and the optoelectronic display device remain in a closed state, and the optoelectronic display device remains highly transparent and does not affect the driver's field of vision.

[0045] In the working state, the projection emitting device is turned on, and the vehicle speed, navigation and other information it projects pass through the photoelectric display device, and the projection display area is displayed in front of the front windshield (122) of the vehicle. The thickness of the tungsten transparent conductive electrode in the photoelectric display device is extremely small, and it can simultaneously realize the functions of reflecting the projected information and transmitting external information. The driver can observe the transmitted information and the external environment through the device at the same time.

[0046] The device's refractive index and reflectivity are primarily influenced by the thickness of the tungsten transparent conductive electrode and the silver conductive electrode. The device's inherent design makes it difficult to achieve both high reflectivity and high transmittance simultaneously. Improving the device's reflectivity requires a sufficient reflective layer thickness, but excessively thick reflective layers can reduce the device's transmittance. For example, with a 250nm thick tungsten oxide cathode electrochromic material layer, when the tungsten transparent conductive electrode is 10nm thick and the silver conductive electrode is 5nm thick, the device's transmittance within the visible light wavelength range remains roughly within 10%-20%. At this point, the device's transmission is poor, while its reflection is pronounced.

[0047] Therefore, in order to balance the transmission and reflection effects of the device, it is necessary to reasonably adjust the thickness of both the tungsten transparent conductive electrode and the silver conductive electrode.

[0048] Taking the tungsten oxide cathode electrochromic material layer with a thickness of 250nm as an example, when the thickness of the tungsten transparent conductive electrode is 4nm and the thickness of the silver conductive electrode is 4nm, the device can achieve better coordination in transmission and reflection effects. While having a strong reflection effect, the transmittance can be maintained at more than 40%. At this time, the transmission and reflection spectra of the device are as follows: Figure 4 shown.

[0049] Compared with tungsten metal materials, silver metal materials have a higher refractive index and absorption coefficient. Therefore, if the transmission and reflection effects of the device need to be further adjusted, changing the thickness of the silver conductive electrode can have a more obvious effect.

[0050] The optoelectronic display device described in this application features multiple color adjustment capabilities, primarily achieved by adjusting the thickness of the tungsten oxide cathode electrochromic material layer and the external voltage. While the thickness of the tungsten oxide cathode electrochromic material layer is determined during production, the device's color change range is primarily adjusted by the external voltage during actual use. Drivers can freely adjust the device's color change based on their personal preferences and the external environment, providing a range of background colors.

[0051] The above is a specific process for using a device for an optoelectronic display, but the implementation method of this application is not limited to the described implementation. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. Application of an optoelectronic display device in a vehicle head-up display system, characterized in that: The vehicle-mounted head-up system includes a projection emission device, a photoelectric display device, a front platform, and a front windshield; The arrangement of the vehicle head-up display system is as follows: the projection emission device is arranged on the front platform of the vehicle, and the photoelectric display device is arranged between the front windshield of the vehicle and the projection emission device at an adjustable distance to adapt to different projection display areas; The film layer structure of the optoelectronic display device is, in order, a first transparent substrate, a tungsten transparent conductive electrode, a tungsten oxide cathode electrochromic material layer, an electrolyte layer, a silver conductive electrode, and a second transparent substrate; the thickness of the tungsten transparent conductive electrode is 2-10 nm; the thickness of the tungsten oxide cathode electrochromic material layer is 150-250 nm; and the thickness of the silver conductive electrode is 2-5 nm.

2. The use according to claim 1, characterized in that The first transparent substrate and the second transparent substrate have the same size, both having a length of 400-2000 mm and a width of 200-2000 mm.

3. The use according to claim 1, characterized in that The method for preparing the optoelectronic display device comprises the following steps: (1) Using a magnetron sputtering process, a tungsten transparent conductive electrode is prepared on a first transparent substrate, and a silver conductive electrode is prepared on a second transparent substrate; (2) Using magnetron sputtering technology, a tungsten oxide cathode electrochromic material layer is prepared on a tungsten transparent conductive electrode; (3) annealing the material layer prepared in step (2); (4) Pressing the first transparent substrate and the second transparent substrate against each other to form a sandwich, and then filling a mixed solution of liquid electrolyte and photocurable resin to complete the packaging; (5) The encapsulated device is irradiated with an ultraviolet lamp to achieve solidification of the electrolyte layer, thereby obtaining the optoelectronic display device.

4. The use according to claim 3, characterized in that: The magnetron sputtering process in step (1) is: DC mode, vacuum environment is 5-10mTorr, sputtering power is 30-50W, and sputtering time is 5-20s; The magnetron sputtering process in step (2) is: DC mode, vacuum environment is 5-10 mTorr, sputtering power is 50-100 W, and sputtering time is 5-15 min; The annealing step in step (3) is carried out in an air atmosphere, the annealing temperature is 100-150° C., and the annealing time is 1-2 h.

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